STANDARD Physics LEDs Assertion Reason Question
Assertion : The semiconductor used for fabrication of visible LEDs must at least have a band gap of 1.8 eV. Reason : The spectral range of visible light is from 0.4 eV to 1.8 eV.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The spectral range of visible light is from about 3 eV to 1.8 eV. Therefore, the semiconductor used for fabrication of visible LEDs must at least have a band gap of 1.8 eV.
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